Pressure-sensitive record material

Abstract

Record material is disclosed comprising paper sheet material coated with droplets of liquid wherein the liquid comprises 2,2,4-trimethyl-1,3-pentanediol diisobutyrate. Said liquid is associated on the record material with at least two color-producing reactants, at least one of which is soluble in said liquid. The liquid is associated with the reactants by either being in close proximity to both reactants or by having one of the reactants dissolved therein and being in close proximity to the other. Of the color-producing reactants, one is a chromogenic dye-precursor and one is a coreactant material capable of developing the color of the chromogenic dye-precursor when the two reactants are brought into reactive contact.

What is claimed is: 
     
       1. Record sheet material comprising a paper sheet having a coating comprising encapsulated isolated droplets of an oil solution of a color-producing reactant material selected from the group consisting of a chromogenic dye-precursor material and an acidic co-reactant material capable of producing color when brought into reactive contact with a material selected from the group consisting of an acidic co-reactant material and a chromogenic dye-precursor, respectively, wherein said oil comprises 2, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate and dissolves at least one percent of the chromogenic dye-precursor. 
     
     
       2. The record sheet material of claim 1 wherein the color-producing reactant material is selected from the group consisting of base-reacting colorless chromogenic dye-precursor materials and acid-reacting materials selected from the group consisting of phenol-formaldehyde novolak resins and ortho-hydroxy aryl carboxylic acid materials capable of producing color in said dye-precursors when brought into reactive contact therewith. 
     
     
       3. The record sheet material of claim 2 in which the oil comprises at least about two-thirds, by weight, 2,2 4-trimethyl-1,3-pentanediol diisobutyrate. 
     
     
       4. The record sheet material of claim 3 in which the oil additionally comprises a high-boiling saturated aliphatic hydrocarbon oil. 
     
     
       5. The record sheet material of claim 4 in which the saturated aliphatic hydrocarbon oil is present in an amount up to about one-third of the total weight of the oil. 
     
     
       6. The record sheet material of claim 2 in which the color-producing reactant material is a base-reacting colorless chromogenic dye-precursor material. 
     
     
       7. The record sheet material of claim 2 in which the color-producing reactant material is a phenol-formaldehyde novolak resin. 
     
     
       8. The record sheet material of claim 2 in which the color-producing reactant material is a metal salt of a phenol-formaldehyde novolak resin. 
     
     
       9. The record sheet material of claim 8 in which the metal is zinc. 
     
     
       10. The record sheet material of claim 2 in which the color-producing reactant material is an ortho-hydroxy aryl carboxylic acid material. 
     
     
       11. The record sheet material of claim 2 in which the ortho-hydroxy aryl carboxylic acid is combined with a metal. 
     
     
       12. The record sheet material of claim 11 in which the metal is zinc.